如何使用字典查找替换列表中的元素 [英] How to replace elements in a list using dictionary lookup
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问题描述
提供此列表
my_lst = ['LAC', 'HOU', '03/03 06:11 PM', '2.13', '1.80', '03/03 03:42 PM']
我想根据字典值更改其0th
和1st
值:
I want to change its 0th
and 1st
values according to the dictionary value:
def translate(my_lst):
subs = {
"Houston": "HOU",
"L.A. Clippers": "LAC",
}
因此列表变为:
['L.A. Clippers', 'Houston', '03/03 06:11 PM', '2.13', '1.80', '03/03 03:42 PM']
推荐答案
如果所有值都是唯一的,则应首先反转dict以得到有效的解决方案:
If all values are unique then you should reverse the dict first to get an efficient solution:
>>> subs = {
... "Houston": "HOU",
... "L.A. Clippers": "LAC",
...
... }
>>> rev_subs = { v:k for k,v in subs.iteritems()}
>>> [rev_subs.get(item,item) for item in my_lst]
['L.A. Clippers', 'Houston', '03/03 06:11 PM', '2.13', '1.80', '03/03 03:42 PM']
如果您只想更新选定的索引,请尝试:
If you're only trying to updated selected indexes, then try:
indexes = [0, 1]
for ind in indexes:
val = my_lst[ind]
my_lst[ind] = rev_subs.get(val, val)
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